L98 Intake Removal/Porting?
Team Owner
Joined: Oct 2004
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From: altered state
St. Jude Donor '05
post up your impressions on how it runs wiht that intake think youll be pleasantly surprised.
Didnt know theres 4 ways to port a tpi lol
Didnt know theres 4 ways to port a tpi lol
Last edited by cv67; Jan 22, 2013 at 12:17 PM.
Le Mans Master
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From: Houston Texas
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Racer
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From: Las Vegas Nevada
Dream build for me... I'm just waiting for the opportunity to strike and get it going. Usually for me, this is in the form of really cheap parts or something breaking.
Le Mans Master
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From: Houston Texas
that was my old set up. I then went with an HSR and when my L98 gave up the ghost I went LSX. 
Race Director
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From: Overland Park Kansas
2020 Corvette of the Year Finalist (appearance mods)
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SLP had an initial version of their runners that were fully siamesed on two pair. The other two pair were left alone. It certainly LOOKS like that's the version you had -- even if you pulled the other two dividers out.
If I didn't mention it on the prior page (of this thread), the idea was to "tune" 4 cylinders with extra low-mid performance while "tuning" the other 4 cylinder with extra mid-high rpm performance.
"Quality" on early SLP castings has frequently been reported as shoddy...which could explain the observations Ziggy saw.
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St. Jude '03 thru '24
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Racer
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From: Las Vegas Nevada
Sorry Greg, I do remember your post. They are more similar to the ones from ch@0s, but not as heavily ported. Probably because of the lack of area for a gasket to seal properly. There are tool marks on the inner parts of the runner, which are very uneven and inconsistent with the other runner. I did my best with carbide bits at work to smooth it out and polish what I could reach. My biggest thing was getting them clean... the entire intake system down to the heads was absolutely filthy.
Le Mans Master
Joined: Oct 2008
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From: Houston Texas
They sealed up just fine. I only touched two of the runners the other two were already like that.
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Thread Starter
Racer
Joined: Aug 2012
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From: Las Vegas Nevada
As a member had asked, I took her out for a drive today after work.
As other's had said, the difference in performance is minimal... sadly. BUT, it feels and sounds much better since I replaced the aged gaskets that had been leaking... so I'm happy. Sprayed some water around the eges of the intake and maifold, and surely the car kept it's steady idle, unlike before. I was worried about the injectors leaking, but they're also ok. I don't have hesitation, and it almost seems quieter in the cabin.
If someone's thinking of doing this, porting isn't necesary... but at least cleaning out the filth and replacing the gaskets will restore some ponies.
As other's had said, the difference in performance is minimal... sadly. BUT, it feels and sounds much better since I replaced the aged gaskets that had been leaking... so I'm happy. Sprayed some water around the eges of the intake and maifold, and surely the car kept it's steady idle, unlike before. I was worried about the injectors leaking, but they're also ok. I don't have hesitation, and it almost seems quieter in the cabin.
If someone's thinking of doing this, porting isn't necesary... but at least cleaning out the filth and replacing the gaskets will restore some ponies.
Le Mans Master
Joined: Oct 2008
Posts: 9,758
Likes: 49
From: Houston Texas
As a member had asked, I took her out for a drive today after work.
As other's had said, the difference in performance is minimal... sadly. BUT, it feels and sounds much better since I replaced the aged gaskets that had been leaking... so I'm happy. Sprayed some water around the eges of the intake and maifold, and surely the car kept it's steady idle, unlike before. I was worried about the injectors leaking, but they're also ok. I don't have hesitation, and it almost seems quieter in the cabin.
If someone's thinking of doing this, porting isn't necesary... but at least cleaning out the filth and replacing the gaskets will restore some ponies.
As other's had said, the difference in performance is minimal... sadly. BUT, it feels and sounds much better since I replaced the aged gaskets that had been leaking... so I'm happy. Sprayed some water around the eges of the intake and maifold, and surely the car kept it's steady idle, unlike before. I was worried about the injectors leaking, but they're also ok. I don't have hesitation, and it almost seems quieter in the cabin.
If someone's thinking of doing this, porting isn't necesary... but at least cleaning out the filth and replacing the gaskets will restore some ponies.
Thread Starter
Racer
Joined: Aug 2012
Posts: 279
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From: Las Vegas Nevada
I'm definitely going with an LT1 intake in the future to keep it looking stock with the covers, and at the same time I'll be changing out the cam for either an LT4 hot or ZZ9 as a member had suggested recently. My goal is only 300hp so I'm not planning on anything expensive.
Team Owner
Joined: Oct 2004
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From: altered state
St. Jude Donor '05
LT1 probably the best improvement + any header you can make.
Porting does help TPIs but they have to be done to death to really see it.
Even at that probably wont get what youd think as far as SOTP,
Most runners are a nightmare to get inside the turn so it bottlenecks you have to get creative or be
enough to spend the time on it.
Porting does help TPIs but they have to be done to death to really see it.
Even at that probably wont get what youd think as far as SOTP,
Most runners are a nightmare to get inside the turn so it bottlenecks you have to get creative or be
enough to spend the time on it.